Rosie’s older sister, a 17-year-old who is pretty and strong-minded, demonstrating confidence and social astuteness during their visit to Chicago, contrasting with Rosie's less sophisticated outlook.

A genial and humorous figure who brings surprise and depth to the story with his rich life history and mischievous personality, as well as providing key plot twists and reflections on American culture.

Rosie's seven-year-old brother, known for being an annoying but humorous character who idolizes Granddad and has a budding interest in filmmaking.

A significant character whose transformation parallels Rosie’s, Euterpe is a timid and lonely widow when first introduced, whose refined nature is challenged by her lively visiting relatives.